Spread butter pieces across bottom of slow cooker. Top with macaroni, Ricotta cheese, and shredded cheddar cheese. Mix well. Pour boiling water over mixture, but DO NOT STIR. Cover and cook on low for 2 1/2 – 3 hours.

When recipe completes cooking, stir and then sprinkle with Parmesan cheese.

Layer 1/3 of the spaghetti sauce, 1/3 of the ground beef, 1/3 of the noodles, 1/3 of the ricotta cheese, and 1/3 of the mozzarella cheese. Repeat layering with remaining ingredients. Cover and cook on low for 3-4 hours.

Cook spaghetti and drain. Transfer to large mixing bowl and add all remaining ingredients. Mix well and pour into slow cooker. You may like to spray the interior of the slow cooker with a nonstick cooking spray. Cover and cook on low for 3-4 hours.